Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
hanh va » hang va, hanh vi
xuc van » duc van, luc van, xuc ban
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
va cuu » va cau, va chu, va huu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh va cuu tre*.